The invention discloses a reducing furnace electrode repairing method. The reducing furnace electrode repairing method comprises the following steps that firstly, cleaning and grinding treatment is conducted on the surface of a to-be-repaired area on a reducing furnace electrode; secondly, inert gas is used for loading to-be-sprayed particles, and after heating is conducted to 200-800 DEG C, the to-be-sprayed particles are sprayed to the surface of the to-be-repaired area; and thirdly, mechanical machining is conducted on a reducing furnace electrode surface coating according to the actual usage size, and a repaired reducing furnace electrode is obtained. According to the reducing furnace electrode repairing method, a repairing body can be dense, and the bonding strength between the repairing body and an electrode base body material is high; based on the electrode component shape, the electrode material deposition precision can be optimized by controlling the nozzle size, spraying parameters, tracks and the like, and the subsequent machining amount is reduced; the thickness and the shape of the repairing body are not limited, and the reducing furnace electrode repairing method canbe used for repairing of electrodes different in damage degree; applicable materials are wide, a base body and the coating can be repaired at the same time, and efficiency is high; and the spraying process is simple, heat treatment is not needed, cost is low, and the production efficiency is high.